A 15 percent concordance rate in MZ twins, with a 8 percent rate in same-sex DZ twins, indicates that
genes play a major role in a trait. Indicate whether the statement is true or false.
F
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The first catalytic and self-replication biological molecule was most likely
A) RNA. B) DNA. C) proteins. D) ATP.
Excess nutrients in the aquatic environment can cause an initial population surge of primary producers, but eventually results in a collapse of the ecosystem. Which of the following answer choices is not a direct reflection of this statement?
A. Habitats have a particular carrying capacity. B. All trophic levels can be interdependent. C. Communities are shaped by the physical environment. D. Animals interact with their physical environment.
Leaves:a
represent a fairly small fraction of the overall metabolic budget for a plant. b. depend on the roots to supply CO2. c. are the main photosynthetic organ of most plants. d. are the main site of water uptake in plants. e. prevent CO2 and O2 from entering the plant.
______ are membranes containing concentrated organic molecules and have some life-like properties (i.e. share characteristics with cells) but are not alive
a. prokaryotes b. polypeptides c. protobionts d. ribozymes e. pseudocells